Forces and Motion 2

• In a distance time graph what is on the x-axis?


  Time.
• In a distance time graph what is on the y-axis?


  Distance.
• In a distance time graph speed is represented by?

  Speed is represented by the gradient.
• How do you calculate speed?

  speed = distance/time
• How do you calculate average speed?

  average speed = total distance moved / total time taken
• What is acceleration?

  The rate of change of velocity.
• How do you calculate acceleration?


  a = ( v - u) /t
• what is the unit for acceleration?

  m/s 2
• What is velocity?

  The speed of an object in a particular direction.
• What is the unit for velocity?

  m/s
• How do you find the distance travelled from a velocity time graph?

  The area under the graph.
• In a velocity time graph what is on the x-axis?


  Time
• In a velocity time graph what is on the y-axis?


  Velocity
• What is uniform acceleration?

  It is constant acceleration.
• How do you calculate uniform acceleration?

  v2 = u2 + 2as
• How can a force affect an object?

  It can cause changes in:

  - speed

  - direction

  - shape
• What is a force?


  a push or pull.
• What is thrust?

  a type of pushing force eg the thrust of rocket motors.
• What is a scalar quantity?


  A quantity that has magnitude but no direction such as speed.
• What is a vector quantity?

  A quantity that has magnitude and direction such as velocity.
• Give 5 examples of forces.

  - weight

  - Air resistance

  - Friction

  - Tension

  - Electrostatic
• What is weight?


  the force of gravity acting on an object.
• What is mass?


  the amount of matter in an object.
• What is speed?


  the distance travelled per unit time.
• What is resultant force?

  The total effect of two or more forces acting on an object.
• What is friction?

  force that opposes the motion of an object.
• How do you calculate resultant force?

  F = ma
• What is Newtons second law of motion?

  F = ma
• How do you calculate weight?


  W=mg
• What is the unit for g, Gravitational field strength?


  Newtons per kilogram (N/kg)
• What is stopping distance?


  The total distance travelled during the time it takes to stop a vehicle in an emergency.
• How do you calculate stopping distance?

  Stopping distance = Thinking distance + braking distance
• what is stopping distance?

  the total distance travelled during the time it takes for vehicle to stop in an emergency.
• What is thinking distance?


  total distance travelled during the time it takes the driver to react to an emergency and stop the vehicle
• What is braking distance?

  the total distance travelled under the braking force.
• how do you calculate stopping distance?

  stopping distance = thinking distance + braking distance
• What factors affect thinking distance?


  speed of the vehicle

  reaction time of the driver
• what factors affect reaction time?

  being distracted

  being intoxicated

  being tired
• What factors affect braking distance?

  road conditions

  tyre conditions

  speed of the vehicle
• what factors affect stopping distance?

  speed of the vehicle

  mass of the vehicle

  road conditions

  drivers reaction time